Thalidomide: An Active Agent in AILT Lymphoma

Angioimmunobalstic T cell lymphoma (AILT) is a relatively rare subtype of lymphoma, accounting for approximately 1 – 2% of all cases of NHL. The pathogenesis is thought due to clonal expansion of follicular T-helper cells which subvert normal germinal centre function. It is characterised by systemic disease and significant immune dysregulation with frequent atypical infections and autoimmune disease. It has a poor prognosis with a median survival of less than 3 years using CHOP or CHOP-like regimens. Dose intensification, or anthracycline use, appears to be ineffective. Thalidomide is an immunomodulatory agent with isolated case reports of activity in this disease. We report 3 cases of AILT where thalidomide was effective at inducing or providing a sustained remission. Case 1 was an 86 year old woman who presented with systemic symptoms, widespread lymphadenopathy and a polyclonal increase in immunoglobulins. AILT was diagnosed from both lymph node biopsy and bone marrow biopsy. Symptoms improved only temporarily with prednisone. She commenced thalidomide at 200mg daily with improvement in symptoms and resolution of lymphadenopathy and after 2 months the dose was reduced to 100mg daily. She continued the thalidomide at the same dose and remained in remission until her death from unrelated causes 4 years later Case 2 was a 72 year old man who initially presented with autoimmune haemolytic anaemia and red cell aplasia which was unresponsive to steroids, intravenous immunoglobulins (IVIG), cyclosporine and splenectomy. He then developed cervical and axillary lymphadenopathy, biopsy of which showed AILT. Bone marrow examination showed no evidence of AILT. He commenced thalidomide at 150mg daily with resolution of the haemolysis and red cell aplasia within 12 days and reduction in all lymphadenopathy. He remains in remission 3 months after commencing thalidomide and is currently on 100mg daily. Case 3 was a 57 year old woman presented with ITP with platelets There are now several case reports in the literature indicating that thalidomide is effective in AILT which is reflected by the cases reported here. Given the poor prognosis of AILT using conventional chemotherapeutic regimens, such as CHOP, prospective clinical trials using thalidomide, or the newer derivatives such as lenalidomide, are warranted.